Answer:

theta

Answer	Crossword Clue
THETA	Greek letter
THETA	Iota preceder
THETA	Fraternity letter

THETA	Letter after eta
THETA	Angle symbol
THETA	Iota's predecessor
THETA	Brain wave of the semiconscious
THETA	First Greek-letter fraternity for women, for short
THETA	Phi Delta ... (fraternity formed in 1848)
THETA	Eta follower
THETA	Eighth Greek letter

THETA	Campus letter
THETA	Plane angle symbol, in geometry
THETA	Eighth of 24
THETA	Letter before iota
THETA	Round Greek letter
THETA	Frat letter
THETA	It precedes iota
THETA	Eighth letter of the Greek alphabet

THETA	Sweater letter
THETA	Sorority letter
THETA	It comes before iota
THETA	Symbol for an angle in trigonometry
THETA	Greek letter often seen in trigonometry
THETA	Greek letter with a line through its middle
THETA	Iota's preceder
THETA	Angle measurement symbol

THETA	Angle symbol, in trigonometry
THETA	Angle symbol, in trig
THETA	Symbol in geometry
THETA	Certain sorority member
THETA	8th Greek letter
THETA	.. rhythm: brain waves pattern
THETA	Trigonometric angle symbol
THETA	Trig symbol

THETA	Angle symbol in geometry
THETA	Angle symbol in trig
THETA	Letter thought to resemble a skull
THETA	Symbol used in polar coordinates
THETA	Letter preceding iota